Tolong jawab cepat ya.... Question from @syasya3576

October 2018 2 11 Report

Tolong jawab cepat ya

Mufi 25) Luas arsir = Luas trapesium - luas 1/4 lingkaran
= [1/2 (20+13) (7)] - [1/4 x 22/7 x 7 x 7]
= 231/2 - 77/2
= 77 cm (c)
26) luas 3/4 lingkaran = 3/4 x π x r xr
= 3/4 x 22/7 x 6 x 6
=84,85

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Mufi ralat : 3/4 x 3,14 x 6 x 6 = 84,78

MicoArrafi Nomor 26

$$\begin{align} L_{arsir}&=L_{trapesium}-L_{\frac{1}{4}\odot}\\&=\left(\frac{(a+b)\times t}{2}\right)-\left(\frac{1}{4}\times\pi\times r^2\right)\\&=\left(\frac{(20\ \text{cm}+13\ \text{cm})\times7\ \text{cm}}{2}\right)-\left(\frac{1}{4}\times\frac{22}{7}\times(7\ \text{cm})^2\right)\\&=115,5\ \text{cm}^2-38,5\ \text{cm}^2\\&=\boxed{77\ \text{cm}^2}\ \bold{(c.)} \end$

Nomor 27

$$\begin{align} L_{\frac{3}{4}\odot}&=\frac{3}{4}\times\pi\times r^2\\&=\frac{3}{4}\times3,14\times(6\ \text{cm})^2\\&=\boxed{84,78\ \text{cm}^2}\ \bold{(b.)} \end$

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